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There are many research methods available to psychologists in their efforts to understand, describe, and explain behavior and the cognitive and biological processes that underlie it.

Nondisjunction

Nondisjunction

During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.

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Updated: Mar 6, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas

Published on: September 5, 2011

Parapagus Conjoined Twin : A Case Report.

Kumar Bahadur Bista¹, Sharmila Ghimire², Sandesh Acharya³

¹Department of Gynecologic Oncology, Bhaktapur Cancer Hospital, Bhaktapur, Nepal.

JNMA; Journal of the Nepal Medical Association

|March 5, 2026

Summary

This summary is machine-generated.

A rare case of dicephalic parapagus conjoined twins was diagnosed during a routine anomaly scan. This report highlights the diagnostic and management challenges associated with such complex twin pregnancies.

Area of Science:

Maternal-Fetal Medicine
Medical Imaging
Genetics

Background:

Conjoined twins are rare congenital anomalies.
Dicephalic parapagus twins present unique diagnostic and management challenges.

Keywords:

conjoined twins thoraphagus twin pregnancy

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Early and accurate diagnosis is crucial for appropriate management.